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All answers having "Flustered" as clue:

5 Character Answers:

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ATSEA

UPSET



7 Character Answers:

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DITHERY

INASTEW

INASTIR

RATTLED



8 Character Answers:

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AGITATED

INASTATE

INATIZZY

UNNERVED



10 Character Answers:

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TONGUETIED